common: Add chat message reply flows and APIs

[richtrwhereby]

Description

Add an optional parentId value to the sendChatMessage API in both Core and Browser SDKs. By passing the id of the message that we want to reply to in this parentId argument, we can construct threaded messaging within rooms.

Related Issue:

Built on top of #1008 due to shared code space.

Testing

1. Run pnpm build && pnpm dev
2. When storybook starts, navigate to "Stories" > "Custom UI" > "Room connection only"
3. Join a Whereby room from this UI
4. Additionally, join the same Whereby room from the standard Whereby interface (non-SDK).
5. Send a chat message in the room via the storybook UI
6. When the chat message appears, select "Reply to: [text]" from the "Send to room" select dropdown and click "Send message".
7. Verify that the message appears as a 'reply' to the first message in the standard Whereby interface.

Checklist

• My code follows the project's coding standards.
• Prefixed the PR title and commit messages with the service or package name
• I have written unit tests (if applicable).
• I have updated the documentation (if applicable).
• By submitting this pull request, I confirm that my contribution is made
  under the terms of the MIT license.

[changeset-bot]

🦋 Changeset detected

Latest commit: b86c66d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@whereby.com/media	Minor
@whereby.com/browser-sdk	Minor
@whereby.com/core	Patch
@whereby.com/assistant-sdk	Patch
@whereby.com/react-native-sdk	Patch

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